多选题Which two mechanisms can be used to detect IPsec GRE tunnel failures？（）ADead Peer Detection （DPD）BCDPCisakmp keepalivesDGRE keepalive mechanismEThe hello mechanism of the routing protocol across the IPsec tunnel
多选题
Which two mechanisms can be used to detect IPsec GRE tunnel failures？（）
A
Dead Peer Detection （DPD）
B
CDP
C
isakmp keepalives
D
GRE keepalive mechanism
E
The hello mechanism of the routing protocol across the IPsec tunnel
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